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* [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals
@ 2012-03-04 20:58 eu at doxos dot eu
2012-03-04 22:56 ` [Bug c++/52485] " pinskia at gcc dot gnu.org
` (4 more replies)
0 siblings, 5 replies; 6+ messages in thread
From: eu at doxos dot eu @ 2012-03-04 20:58 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
Bug #: 52485
Summary: [c++11] add an option to disable c++11 user-defined
literals
Classification: Unclassified
Product: gcc
Version: 4.7.0
Status: UNCONFIRMED
Severity: enhancement
Priority: P3
Component: c++
AssignedTo: unassigned@gcc.gnu.org
ReportedBy: eu@doxos.eu
Some upstream code (e.g. #50917 for Mozilla, I have issues with Qt4's SLOT(...)
macros) is broken because of the support for c++11 literals in 4.7. In all
cases I've seen the cause was missing space between constructs like #define
FOO(a) "0"#a.
Sine this feature is little used, but lot of code, it would be reasonable to
provide a switch to disable user-defined literals, so that code which needs
c++11 but at the same time links to (technically broken) libs can be compiled,
until those libs get fixed upstream.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52485] [c++11] add an option to disable c++11 user-defined literals
2012-03-04 20:58 [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals eu at doxos dot eu
@ 2012-03-04 22:56 ` pinskia at gcc dot gnu.org
2012-03-05 8:55 ` eu at doxos dot eu
` (3 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: pinskia at gcc dot gnu.org @ 2012-03-04 22:56 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> 2012-03-04 22:56:18 UTC ---
I think we should not have an option to disable user-defined literals at all.
Since their code is not C++11, they should fix their code to be C++11 if they
use the -std=c++11/-std++0x option.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52485] [c++11] add an option to disable c++11 user-defined literals
2012-03-04 20:58 [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals eu at doxos dot eu
2012-03-04 22:56 ` [Bug c++/52485] " pinskia at gcc dot gnu.org
@ 2012-03-05 8:55 ` eu at doxos dot eu
2012-03-05 9:07 ` jakub at gcc dot gnu.org
` (2 subsequent siblings)
4 siblings, 0 replies; 6+ messages in thread
From: eu at doxos dot eu @ 2012-03-05 8:55 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
--- Comment #2 from Václav Šmilauer <eu at doxos dot eu> 2012-03-05 08:55:12 UTC ---
(In reply to comment #1)
> I think we should not have an option to disable user-defined literals at all.
> Since their code is not C++11, they should fix their code to be C++11 if they
> use the -std=c++11/-std++0x option.
You were right in an ideal world. OTOH it is a point where c++11 breaks
backward-compatibility with legal c++03 code; therefore, as an interim solution
before "they" fix "their" code (think how long does it take before Qt fixes
their code and the fixes come downstream? A year?), optinally disabling this
feature would be useful.
The fix is always putting some extra spaces in macro definitions; it can (will)
be hacked around on a case-by-case basis and that is ugly.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52485] [c++11] add an option to disable c++11 user-defined literals
2012-03-04 20:58 [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals eu at doxos dot eu
2012-03-04 22:56 ` [Bug c++/52485] " pinskia at gcc dot gnu.org
2012-03-05 8:55 ` eu at doxos dot eu
@ 2012-03-05 9:07 ` jakub at gcc dot gnu.org
2012-03-05 9:20 ` eu at doxos dot eu
2012-11-12 15:00 ` paolo.carlini at oracle dot com
4 siblings, 0 replies; 6+ messages in thread
From: jakub at gcc dot gnu.org @ 2012-03-05 9:07 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-03-05 09:07:21 UTC ---
That is not ugly, that is the right thing to do. Every GCC version has some
changes that require changes in lots of application sources (see
http://gcc.gnu.org/gcc-4.N/porting_to.html for various N), this is just one of
them, documented and fairly trivial to discover and fix. If you don't have a
C++11 source, don't compile with -std=c++11.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52485] [c++11] add an option to disable c++11 user-defined literals
2012-03-04 20:58 [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals eu at doxos dot eu
` (2 preceding siblings ...)
2012-03-05 9:07 ` jakub at gcc dot gnu.org
@ 2012-03-05 9:20 ` eu at doxos dot eu
2012-11-12 15:00 ` paolo.carlini at oracle dot com
4 siblings, 0 replies; 6+ messages in thread
From: eu at doxos dot eu @ 2012-03-05 9:20 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
--- Comment #4 from Václav Šmilauer <eu at doxos dot eu> 2012-03-05 09:20:26 UTC ---
I think you understood my source _is_ c++11, but the libs I have to use are
not; therefore I have to compile with -std=c++11. The the fix is admittedly
trivial and documented, but consists in editing 3rd-party headers. It is ugly
and right at the same time.
Close this bug if it has no chance.
^ permalink raw reply [flat|nested] 6+ messages in thread
* [Bug c++/52485] [c++11] add an option to disable c++11 user-defined literals
2012-03-04 20:58 [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals eu at doxos dot eu
` (3 preceding siblings ...)
2012-03-05 9:20 ` eu at doxos dot eu
@ 2012-11-12 15:00 ` paolo.carlini at oracle dot com
4 siblings, 0 replies; 6+ messages in thread
From: paolo.carlini at oracle dot com @ 2012-11-12 15:00 UTC (permalink / raw)
To: gcc-bugs
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52485
Paolo Carlini <paolo.carlini at oracle dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution| |INVALID
--- Comment #5 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-11-12 14:59:40 UTC ---
Closing.
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2012-11-12 15:00 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2012-03-04 20:58 [Bug c++/52485] New: [c++11] add an option to disable c++11 user-defined literals eu at doxos dot eu
2012-03-04 22:56 ` [Bug c++/52485] " pinskia at gcc dot gnu.org
2012-03-05 8:55 ` eu at doxos dot eu
2012-03-05 9:07 ` jakub at gcc dot gnu.org
2012-03-05 9:20 ` eu at doxos dot eu
2012-11-12 15:00 ` paolo.carlini at oracle dot com
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